# AI先生　第一種電気工事士 vs Compendium Lab

The clearest difference is in-app purchases: AI先生　第一種電気工事士 at none against Compendium Lab's 1. AI先生　第一種電気工事士 also leads on update cadence (every 2 weeks vs every 4 weeks). Compendium Lab's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Compendium Lab sells 1 one-off in-app purchase. AI先生　第一種電気工事士 asks for nothing beyond the download.

AI先生　第一種電気工事士 ships an update every 2 weeks, Compendium Lab every 4 weeks. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | AI先生　第一種電気工事士 | Compendium Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 4 weeks |
| Size | 7 MB | 106 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [reiko hori](https://appshunter.io/developer/1777370692) | [Byoungho Kim](https://appshunter.io/developer/1888452963) |

## What reviewers say

### AI先生　第一種電気工事士

[App page](https://appshunter.io/ios/app/ai/id6738264678)

**Features:** macOS Compatibility

**In-app purchases:** none


### Compendium Lab

[App page](https://appshunter.io/ios/app/compendium-lab-math-and-ai/id6791996424)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Compendium Lab Pro | $5.99 | one-time |


## Frequently asked questions

### Is AI先生　第一種電気工事士 free?

AI先生　第一種電気工事士 is free to download, with no in-app purchases.

### Is Compendium Lab free?

Compendium Lab is free to download, with in-app purchases available.

### Do AI先生　第一種電気工事士 or Compendium Lab have ads?

AI先生　第一種電気工事士 shows ads; Compendium Lab does not.

### Which is updated more often, AI先生　第一種電気工事士 or Compendium Lab?

AI先生　第一種電気工事士 ships an update every 2 weeks, and Compendium Lab every 4 weeks. Most recently, AI先生　第一種電気工事士 was updated on October 16, 2026 and Compendium Lab on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*